JPS585287A - Paper for low-noise impact type printing - Google Patents

Abstract

PURPOSE:To lower the stiffness and Young's modulus of a paper as well as lessen the striking noise of an impact printer, by including or coating micro liquid capsules in or on the surface of the paper to be used in the impact printer. CONSTITUTION:Micro capsules into which a liquid composed primarily of water is confined are formed. The micro capsules are added into pulp before being made into paper, or coated on the surface of a paper to obtain a printing paper. When print striking forces are applied to the printing paper thus obtained by an impact printer, the micro capsules contained in the paper are broken, and the liquid confined in the micro capsules is diffused to lower the Young's modulus and stiffness of the paper. Thus, the intrinsic frequency of the paper is lowered and noise is, therefore, reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves adding microscopic liquid capsules to paper or coating the surface of the paper, and during the printing operation of an impact printer, the liquid capsules are destroyed by impact and the liquid inside is dispersed into the paper. This invention relates to printer paper that reduces noise generation.

Recently, in response to the rapid development of computers and other office equipment, office automation/
It is often said.

One of the purposes of office automation is to install various types of office equipment, including convenience computers, in offices to streamline and improve work efficiency. What should not be avoided is the noise emitted by various office equipment.

There is an urgent need to reduce the noise emitted by various office equipment as much as possible and make the environment as comfortable as possible.

This paper is an attempt to use the characteristics of paper used in printers to reduce noise more economically.

In other words, the present inventors considered impact noise in impact printers to be caused by the impact vibration caused by the print head propagating through the printer paper and being diffused as noise from the surface of the printer paper, and researched noise reduction from the aspect of the printer paper. . As a result, it was found that there is a relationship between the Young's modulus and stiffness of printer paper and the impact sound. I understand.

Therefore, in order to reduce noise, it is necessary to add moisture to printer paper by some means. By the way, it is possible to add moisture to paper during or after the paper is formed, but in order to retain more moisture than normal moisture (about J-), special packaging must be done after the addition. .

The present inventors have found that the impact noise of printer paper is caused by the vibration of the impact propagating through the printer paper, so in order to reduce the noise, it is necessary to reduce the Young's modulus and stiffness of the printer paper after impact. The present invention was achieved after learning that this is important and that it is not necessarily necessary to create printer paper with a high moisture content from the beginning, but that it is sufficient to add moisture near the impact point.

That is, the present invention resides in a low-noise impact printer paper characterized by having microcapsules containing water or a water-based liquid internally added to or coated on the paper.

According to the printer paper of the present invention, when printing impact force is applied by an impact printer, the nine microcapsules contained in the paper are destroyed, and the water sealed inside is diffused into the fine paper, which increases the Young's modulus of the paper and Stiffness decreases. As a result, the natural frequency of the paper is significantly lowered, vibration of the printer paper accompanying printing impact, that is, vibration due to solid propagation, can be reduced, and noise radiated from the surface of the printer paper can be significantly reduced. Furthermore, since the water content of the paper increases, the electrical resistance of the paper decreases, and an antistatic effect can also be obtained.

Furthermore, compared to other methods of softening paper, this method has the advantage of being relatively lightweight. The present invention will be explained in more detail below using examples.

Example 1 Ethyl-α-cyanoacrylate lOf toluene Q
Water 2009 is added while stirring the solution. As a result, water becomes minute droplets, around which ethyl-α-cyanoacrylate polymerizes. This gave hardened microcapsules which were insoluble in toluene and had polyethyl-α-cyanoacrylate walls and contained water. Next, each microcapsule was taken out by scooping it with a net and drying it.

The microcapsules obtained above were added to the pulp together with a dispersant at a ratio of ioH to pulp, and fixed with sulfuric acid. This was used as paper stock to make paper by a conventional method to obtain printer paper having a basis weight of j Of/-.

When the printer paper thus obtained was printed using an impact printer with an impact force of at least At Regier, it was observed that the impact sound was clearly lower than that of untreated (containing no microcapsules) printed paper. Ta. In this case, there was no effect on printing.

Example λ The microcapsules obtained in Example 1 were placed in an alkaline aqueous solution of styrene-maleic anhydride copolymer resin at a solid content concentration of 1.
It was dispersed at a ratio of 0% to prepare a coating liquid. Apply this coating liquid to the surface of commercially available printing paper with a weight of jet/- in an amount j f/d.
It was coated at a ratio of When this printer paper was printed with an impact force of 6 millijoules or more in the same manner as described above, it was observed that the impact sound became weaker as in Example 1. In this case as well, there was no effect on printing.

In the above embodiments, only water was encapsulated in the small Shehui capsules, but of course glycerin, ethylene glycol, alcohol, perfumes, etc. may be mixed with the water.

In addition, as a paint for coating microcapsules on the paper surface, the above-mentioned styrene-maleic anhydride copolymer resin Alf
) In addition to an aqueous solution, it is preferable to use a water-soluble resin with good wettability such as casein or polyvinyl alcohol together with a surfactant.

As explained above, according to the present invention, the liquid capsules are contained in the paper itself, and the liquid capsules are destroyed by pressure such as impact from an impact printer, increasing the water content of the paper and increasing the Young's modulus. By reducing the noise level, it is possible to reduce noise, and the paper preparation is a compact and low-cost structure, and is effective in reducing noise, especially when used in an office.

Representative patent applicant Tomoekawa Paper Mill Co., Ltd.

Claims (1)

[Claims] A low-noise impact printer paper characterized in that microcapsules containing water or a water-based liquid are added to or coated on the paper.